http://localhost:8080/handle/123456789/2644 2026-04-18T16:31:37Z 2026-04-18T16:31:37Z SHAROWER, MD. GOLAM http://localhost:8080/handle/123456789/5454 2025-11-23T07:52:28Z 2016-01-01T00:00:00Z

BIOECOLOGY AND CHEMICAL CONTROL OF AEDES MOSQUITOES IN DHAKA CITY SHAROWER, MD. GOLAM A comprehensive research was conducted during January, 2013 to December, 2015 to study the life history traits through the life cycle of the medically important mosquitoes Aedes aegypti (Linnaeus, 1762) and Aedes albopictus (Skuse,1894) and their breeding sites, seasonal distribution affecting occuarence of dengue disease in different areas of Dhaka city and chemical control approach. The period of development from the egg to adult stage for aedes mosquitoes was 8.37±O.18 days for male and 9.5± 0.24 days for female. Female aedes mosquitoes fed with chiken blood showed the highest mean longivity which was 26.23±2.l7days while 10% sucrose fed male recorded 19.23±2.21days which was the shortest mean survival period. Depending on the gonotrophic cycle of aedes mosquitoes their number of eggs and longevity varied. This research investigated aedes mosquito container productivity of each type and identified breedirig sites of aedes larvae. Of total 9,222 households inspected, 1,306 (14.2%) were positive for aedes larvae breeding. Out of total 38,777 wet containers examined in the houses, 2,272 (5.8%) were infested with aedes larvae. Water holding containers, such as tyres, tanks, earthen jars, flower pots and drums were found to be the most common containers for aedes mosquitoes breeding. Tyres in outdoor, tanks in indoor and flower pots in rooftop locations were also important containers for the highest larval breeding. Factors such as independent household, presence of a water storage system in the house, and fully/partly shaded outdoors were found significantly associated with household infestation of aedes larvae. All these containers exhibited risk of breeding aedes mosquitoes. To evaluate ecological variation of their population density in different parts of the Dhaka city among its eight major divisions average highest density of both these mosquitoes at all the life stages viz. eggs, larvae, pupae and adults was in Tejgaon division with 2960±9.82, 2329 ±4.36, 1786.33±35.92 and 1369.67±16.50 respectively and the lowest density of 1556±51.39, 1122.67±32.88, 764±34.39 and 570.67±7.02 in Lalbagh division. The seasonal distribution of the aedes mosquitoes showed that the highest density of eggs, larvae, pupae and adults was found in Iune respectively following May with their mean numbers of 556±103.94, 451.76±103.42, 356.72±102.06 and 29 1.44±91.85respectively. The abundance of these mosquitoes was related to prevailing rainfall and temperature in these months. The highest LDso value of used petroleum oil as diesel was 12.57 after 6hr following kerosine and the lowest LDsovalue of organophosphorous insecticide as temephos was 1.24 after 24 hr of 1st instar larvae. The efficacy of the the tested insecticides decreased with developing larval instars and the LDso values thus increased. The pyrethroid insecticides such as pralemethin, deltamethin and permethrin killed almost at similar level, but their effectiveness appeared to be next to organophosphorous insecticide temephos. A thesis Submitted to the faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, In partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY IN ENTOMOLOGY

2016-01-01T00:00:00Z MD. ZAKARIA http://localhost:8080/handle/123456789/5252 2024-11-20T04:02:43Z 2021-01-01T00:00:00Z

DEVELOPMENT OF AN INTEGRATED MANAGEMENT APPROACH AGAINST MAJOR ARTHROPOD PESTS OF CAPSICUM MD. ZAKARIA Capsicum cultivation plays a crucial role in the agricultural economy of Bangladesh, but the infestation of major insect pests poses significant challenges to its productivity and sustainability. The primary objective of this study was to develop an effective Integrated Pest Management (IPM) package to combat major insect pests affecting capsicum. The study conducted between 2018 and 2022 encompassed four experiments. Initially, a field survey was conducted in Rajbari, Bogura, Sylhet, Kishoreganj and Manikganj districts in Bangladesh, focusing on intensive capsicum cultivation areas. Results showed that 36% of the surveyed areas experienced low pest infestation, 22.4% faced moderate infestation, and only 4.8% had severe infestation. Capsicum growers utilized diverse control measures, with 71.14% employing a combination of chemical and other methods, while a mere 5.77% practiced fully non-chemical approaches to combat pests such as thrips, aphids, fruit borers, mites, and whiteflies. The highest healthy fruit yield recorded was 24.38 tons ha -1 , and the maximum benefit-cost ratio (3.12) was observed in Capsicum Grower’s Practice (CGP)-8 (Combination of chemicals, bio-pesticide, mechanical, cultural and mulching materials). The second experiment aimed to screen potential capsicum varieties for their resistance to pests by employing different mulching materials. Among the four varieties tested, California Wonder demonstrated the best resistance to pests and yielded higher produce. Combining California Wonder variety with black polythene mulching showed superior performance in controlling pest infestations at various growth stages, leading to improved yields compared to other varieties and combinations. In the third experiment, eight treatments were tested, focusing on the entire growth period, infestation levels of whiteflies, aphids, thrips, fruit borers, and mites, healthy and infested leaves and fruits per plant, and yield-contributing characteristics. Treatment T 3 , involving Imidacloprid 20% SL @ 0.5 ml/L of water with a 7-day interval exhibited the best results. The lowest performance was observed in the controlled plots (T 8 ), followed by T 7 (field sanitation + pheromone trap). A comparison between two fields indicated that the farmer's field in Hemayetpur village, Singair upazila, Manikganj district, outperformed the experimental field at Sher-e-Bangla Agricultural University, Dhaka. The final experiment conducted in the fourth year aimed to develop an integrated management approach against major capsicum pests using six packages. Package P 2 (black polythene + field sanitation + pheromone trap + Spinosad-45% SC @ 0.4 ml/L of water with a 7-day interval) demonstrated the best performance in terms of insect pest incidence, yield and yield-contributing factors. The untreated controlled plots (P 6 ) exhibited the lowest performance. Overall, the study concludes that package P 2 , comprising black polythene, field sanitation, pheromone trap, and Spinosad-45% SC @ 0.4 ml/L of water, presents an effective integrated management approach against major pests infesting capsicum. A dissertation Submitted to the faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka In partial fulfilment of the requirements for the degree of DOCTOR OF PHILOSOPHY IN ENTOMOLOGY

2021-01-01T00:00:00Z DAS, KRISHNA RANI http://localhost:8080/handle/123456789/4780 2023-01-31T03:47:44Z 2021-01-01T00:00:00Z

HOST PLANTS, POPULATION DYNAMICS, SPECIES DIVERSITY, BIOLOGY AND MANAGEMENT OF VEGETABLE LEAF MINER DAS, KRISHNA RANI Five experiments were conducted in different locations such as in Entomology laboratory and central farm of Sher- e- Bangla Agricultural University along with nine agricultural regions of Bangladesh during May, 2019 to July, 2021 to study the host plants, population dynamics, species diversity, biology and management of vegetable leaf miner. Thirty three different crop plants, ornamental plants and weeds under families Fabaceae, Solanaceae, Cucurbitaceae, Brassicaceae, Amaranthaceae, Asteraceae, Boraginaceae and Convolvulaceae were recorded as host plants for Liriomyza spp. in nine agricultural regions of Bangladesh. The leaf infestation percent caused by leaf miner on various host plants in these regions showed a substantial variation ranging from 5.24±2.11 to 83.37±18.45 while the highest infestation was recorded on yard long bean and the lowest infestation on bon begun in Dhaka region. Considering population dynamics the lowest number was recorded in September (3) followed by August (6.5) while the highest number was observed in April (362) followed by March (191.25). Weather factors such as average temperature, rainfall, relative humidity and monthly rainy days influenced Liriomyza population. Both morphological characteristics and morphometric measurements revealed that both the species Liriomyza sativae and Liriomyza brassicae were present in the adult leaf miner samples having average head length 1.54 ± 0.05 mm, thorax length 0.53 ± 0.017 mm, abdomen length 0.62 ± 0.015 mm. The molecular analysis confirmed the presence of two species Liriomyza sativae and Liriomyza brassicae in study area. L. sativae reared from water melon plants only exhibited low genetic diversity and the obtained values were 3 (N), 2.0 (h), 1.0 (S), 0.66667 (Hd), 0.0030 (Pi) and 0.66667 (K). The development period from egg to adult was 19.56 ± 2.83 days where egg stage lasted for 2.12 ± 0.31 days, larval stage 4.57 ± 0.49 days and pupal stage 7.85 ± 0.67 days in laboratory condition. Irrespective of sex, the longevity of adult leaf miner was 1.5 ± 0.46 days without food source whereas 4.9 ± 2.20 days with supplementary food source. In case of tomato, Proclaim 5SG @ 1.0g L water, Tracer 45SC @ 0.4 ml L -1 water and Vertimec 018EC @ 1.2 ml L -1 water were most effective against Liriomyza leaf miner in both laboratory and field condition. Regarding yard long bean, Tracer 45SC @ 0.4 ml L -1 water and Ecomac 1.8EC @ 1.0 ml L -1 water were most effective against leaf miner among all tested biopesticides in both laboratory and field condition. These treatments attributed to higher yield and might be effective in controlling vegetable leaf miner. A Thesis Submitted to the Faculty of Agriculture Sher-e-Bangla Agricultural University, Dhaka, In partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY IN ENTOMOLOGY

2021-01-01T00:00:00Z TALHA, MUHAMMAD ABU http://localhost:8080/handle/123456789/4324 2022-10-02T06:41:44Z 2020-01-01T00:00:00Z

DEVELOPMENT OF INTEGRATED PEST MANAGEMENT PACKAGES AGAINST SPODOPTERA LITURA (FABRICIUS) IN TROPICAL SUGARBEET TALHA, MUHAMMAD ABU Five experiments were conducted of which one in the laboratory of Entomology division of Bangladesh Sugar crop Research Institute and four in the experimental field of Sher-eBangla Agricultural University during November 2017 to May 2021. In the first experiment, we screened resistant sugarbeet varieties against Spodoptera litura and also asses the level of sugarbeet leaf and beet infestations caused by S.litura.The result showed that Cauvery was a best suited variety and PAC-60008 was most susceptible variety against S.litura. The highest (7.73) number of bore/plant and maximum (14.66) larvae were found in PAC-60008 variety while the lowest (2.20) number of bore/plant and minimum (2.00) larvae were observed in Cauvery variety. The yield of sugarbeet and its related parameters showed positive to Cauvery variety and negative to PAC-60008 variety. The highest yield 89.96 t ha- 1 was found in Cauvery and the lowest yield 76.06 t ha- 1 was found in PAC60008 variety. The Brix (18.23%) and Pol (13.45%) was highest in Cauvery and lowest (brix-14.70%, pol-11.18%) in PAC-60008. An integrated management for S. litura control is indoor residual spraying (IRS) that represents one of the main tools for evaluation of effectiveness of insecticides on different life stages of S. litura under laboratory condition. The lowest days of adult emergence and weight of larvae were found (19±0.5) days and (17.8±0.8) mg at T6 (Nitro 505EC solution @ 2.0 ml/lit of water) treatment. The highest (92.5 %) mortality at 3rd instar larvae of S. litura was found at T treatment. To identify the most effective insecticides for managing S. litura in tropical sugarbeet and determine the effective dose of insecticides to control the pest an experiment was conducted at field condition. As a result the T 3 (Nitro 505EC) and T 5 6 treatment (Virtako 40 WG) was the best suited and effective treatment against insect larvae compared to other. In order to evaluation the effectiveness of botanicals and non-chemical approaches against S. litura and find out the eco-friendly management practices an experiment was conducted at field level. The T treatment (Neem Oil @ 3.0 ml/ lit of water) was showed the most effective treatment in this experiment. Finally, an integrate approaches for the best possible combinations of the tools identified from the previous experiment as effective against S. litura for safe and hazards free tropical sugarbeet production. The T treatment (Pheromone trap + Hand Picking + Nitro 505EC) was the best suited treatment. The highest (78.43 %) efficacy was observed in T 10 10 treatment as compared to other. The highest Brix (19.50 %) and the Pol (12.00 %) were found in T 10 treated plots followed by 18.66 % Brix and 11.83 % Pol were found in T treatment. The highest (814.67 g) individual beet weight was found in T treated plot followed by 807.33 g in T (pheromone trap + hand picking + Virtako 40WG) where as the lowest individual beet weight was 722.67 g in T 9 (control) plot. It indicates that as the pest infestation increased so decreased the beet yield. A Dissertation Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY IN ENTOMOLOGY

2020-01-01T00:00:00Z